Audio system base



FIG. 1 is a front elevational view of an audio system base showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view thereof, the left side elevational view being a mirror image of the right side elevational view;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front, right, and bottom perspective view thereof; and,

FIG. 7 is a front, right, and bottom perspective view of the audio system base of FIG. 6, as shown in one environment, the environment being in broken lines, the environment not being a part of the disclosed and claimed design. 

The ornamental design for an audio system base, as shown and described. 